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3 years ago

13

PLZ SHOW all WORK 40 points!!!!

2 answers:

Elena-2011 [213]3 years ago

5 0

Answer:

Kim is 24 and her sister is 12.

Step-by-step explanation:

a) Xx2+X

I used the variable X because that represents Kim's sisters age, which you need to know in order to find out Kim's age. To get Kim's sisters age use a guess and check table or pick numbers until you get to the correct answer.

b) 12x2=24

24+12=36

My solution is Kim is 24 and her sister is 12.

jolli1 [7]3 years ago

5 0

Kims Age let it be (k)
Her sister s age let it be (s)

2(s)=(k) *kim is twice of the age
(k)+(s)=36. *they add up to 36

*since k=2s, subtitude that into the equation k+s=36

(2s)+(s)=36
(3s)=36
s=12

*kim is twice as old as her sister.
12×2=24

*check work
12+24=36
12×2=24
mission accomplished

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